The agglomeration of manufacturing industry in foreign countries has been studied since 1980s, but there are few such studies in china. In the paper, the agglomeration level of 20 two-digit manufacturing industries was measured by the concentration index of industrial space and CRn index in 2002-2005. The result indicates that the whole agglomeration level of China's manufacturing industry is raising continuously and find that some industries show higher degree of concentration in the eastern china, but some industries characterized of scale and scope economies are less concentrated .The agglomeration level of electronic and equipment manufacturing industry is highest and it is the typical representative of industrial cluster. The positive correlation is presented between agglomeration level and economic increase of industry.